EP3625293A1 - Thermal insulation structure - Google Patents

Thermal insulation structure

Info

Publication number
EP3625293A1
EP3625293A1 EP18737702.3A EP18737702A EP3625293A1 EP 3625293 A1 EP3625293 A1 EP 3625293A1 EP 18737702 A EP18737702 A EP 18737702A EP 3625293 A1 EP3625293 A1 EP 3625293A1
Authority
EP
European Patent Office
Prior art keywords
thermal insulation
insulation structure
structure according
inner layer
per molecule
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18737702.3A
Other languages
German (de)
French (fr)
Other versions
EP3625293B1 (en
Inventor
Simon Harry Shepherd
Laura Louise JORDAN
Brian Swanton
Patrick Beyer
Roman Vanecek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Advanced Innergy Ltd
Dow Silicones Corp
Original Assignee
Advanced Insulation Ltd
Dow Silicones Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Advanced Insulation Ltd, Dow Silicones Corp filed Critical Advanced Insulation Ltd
Publication of EP3625293A1 publication Critical patent/EP3625293A1/en
Application granted granted Critical
Publication of EP3625293B1 publication Critical patent/EP3625293B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
    • F16L59/029—Shape or form of insulating materials, with or without coverings integral with the insulating materials layered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/283—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/16—Solid spheres
    • C08K7/18—Solid spheres inorganic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/16—Solid spheres
    • C08K7/18—Solid spheres inorganic
    • C08K7/20—Glass
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/008—Temporary coatings
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
    • E21B36/003—Insulating arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
    • F16L59/028—Compositions for or methods of fixing a thermally insulating material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/101—Glass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/102—Oxide or hydroxide
    • B32B2264/1021—Silica
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/107—Ceramic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/304—Insulating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/12—Polysiloxanes containing silicon bound to hydrogen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups

Definitions

  • Examples of the disclosure relate to a thermal insulation structure, and particularly a thermal insulation structure for a substrate for use subsea.
  • Thermal insulation must have a low thermal conductivity and exhibit the required mechanical properties, such as flexibility. At high temperatures, for instance above 150 degrees centigrade, known thermal insulation can become brittle leading to a deterioration or loss of the required mechanical properties, such as flexibility.
  • thermal insulation which has a low thermal conductivity and exhibits the required mechanical properties, such as flexibility, even at high temperatures, for example, above 150 degrees centigrade.
  • a thermal insulation structure for a substrate for use subsea comprising: an inner layer and an outer layer; the inner layer being the reaction product of a first part and a second part, wherein the weight ratio of the first part to the second part is from about 15: 1 to 1 : 1 , the first part comprises any of alkenyldialkyl terminated polydialkylsiloxane, alkenyldialkyl terminated polydialkylalkenylmethylsiloxane or mixtures thereof, which will individually or collectively have a viscosity of from 250 to l OOOOmPa.s at 25°C, and a hydrosilylation catalyst, wherein the second part comprises a mixture of organohydrogensiloxane having two Si-H bonds per molecule and organohydrogensiloxane having at least three Si-H bonds per molecule; the outer layer being the reaction product of a first part and a second part, wherein the weight
  • the weight ratio of the first part to the second part for the outer layer may be from about 15: 1 to 1 : 1 or may be about 15: 1 to 5: 1 , or may be from about 13: 1 to 8: 1 , or may be about 10: 1.
  • the second part of the inner layer may comprise a mixture of an organohydrogensiloxane having a maximum of two Si-H bonds per molecule and an organohydrogensiloxane having at least three Si-H bonds per molecule.
  • the organo groups may be any suitable organic group but is typically an alkyl group having from 1 to 6 carbon atoms, alternatively methyl or ethyl groups, alternatively methyl groups.
  • the second part for each of the inner and outer layers may comprise any of alkenyldialkyl terminated polydialkylsiloxane, alkenyldialkyl terminated polydialkylalkenylmethylsiloxane or mixtures thereof.
  • the alkenyl groups may be any suitable alkenyl group but typically have from 2 to 6 carbon atoms, alternatively the alkenyl groups are vinyl and/or hexenyl groups but typically all alkenyl groups are vinyl groups.
  • the alkenyl group of the alkenylated MQ silicone resin may comprise 2 to 6 carbon atoms .
  • the alkenylated MQ silicone resin may comprise vinylated MQ resin.
  • the silicon-bonded alkyl groups and/or organic groups as described herein can include substituted and unsubstituted alkyl groups of 1-6 carbon atoms that are otherwise free of ethylenic or acetylenic unsaturation.
  • “Substituted” means one or more hydrogen atoms in a hydrocarbon group has been replaced with another substituent. Examples of such substituents include, but are not limited to, halogen atoms such as chlorine, fluorine, bromine, and iodine; halogen atom containing groups such as chloromethyl, perfluorobutyl, trifluoroethyl, and nonafluorohexyl; oxygen atoms; oxygen atom containing groups such as
  • (meth)acrylic and carboxyl nitrogen atoms; nitrogen atom containing groups such as amino-functional groups, amido-functional groups, and cyano-functional groups; sulphur atoms; and sulphur atom containing groups such as mercapto groups.
  • organohydrogensiloxanes having two silicon bonded hydrogen atoms per molecule when they are present they will be used in a mixture with organohydrogensiloxane having more than two silicon bonded hydrogen atoms per molecule.
  • a first primer may be provided between the inner layer and the substrate.
  • a second primer may be provided between the inner and outer layers.
  • the first and second primers may have different compositions.
  • the inner layer may comprise a syntactic medium.
  • the syntactic medium may comprise microspheres.
  • the microspheres may comprise ceramic microspheres.
  • the inner layer may comprise about 2 to 6 % by weight microspheres, and may comprise about 4 % by weight microspheres.
  • the outer layer may comprise a syntactic medium.
  • the syntactic medium may comprise microspheres.
  • the microspheres may comprise glass microspheres.
  • the microspheres may comprise borosilicate glass microspheres.
  • the outer layer may comprise about 2 to 6 % by weight microspheres, and may comprise about 4 % by weight microspheres.
  • the inner layer may comprise filler.
  • the outer layer may comprise filler.
  • the filler may be reinforcing filler, non-reinforcing filler or a mixture thereof.
  • the inner layer may have a thickness of about 5 to 50 mm, and may have a thickness of about 20 mm.
  • the outer layer may have a thickness of about 10 to 250 mm.
  • a substrate for use subsea comprising a thermal insulation structure according to any of the preceding eleven paragraphs.
  • the substrate may be metal.
  • An anticorrosion coating may be provided on the substrate.
  • the anticorrosion coating may be an epoxy phenolic coating.
  • a method of providing a thermal insulation structure for a substrate for use subsea comprising: providing a structure comprising: an inner layer and an outer layer; the inner layer being the reaction product of first and second parts, wherein the weight ratio of the first part to the second part is from about 15: 1 to 1 : 1 , the first part comprises any of alkenyldialkyl terminated polydialkylsiloxane, alkenyldialkyl terminated polydialkylalkenylmethylsiloxane or mixtures thereof, which will individually or collectively have a viscosity of from 250 to lOOOOmPa.s at 25°C, and a hydrosilylation catalyst, wherein the second part comprises a mixture of organohydrogensiloxane having two Si-H bonds per molecule and organohydrogensiloxane having at least three Si-H bonds per molecule; the outer layer being the reaction product of first and second parts, wherein the
  • Examples of the disclosure provide a thermal insulation structure, and particularly a thermal insulation structure for a substrate for use in subsea applications.
  • the substrate may be, for instance, subsea oil and gas equipment.
  • the thermal insulation structure maintains the temperature of the extracted fluids as they pass through portions of the equipment exposed to the cooling effects of sea water. Items of subsea equipment which benefit from thermal insulation include: wellheads and Xmas trees, spool pieces, manifolds, risers and pipe field joints.
  • the thermal insulation structure comprises an inner layer and an outer layer.
  • the inner layer is the reaction product of a first part and a second part.
  • the ratio of the first part to the second part is about 1 :1.
  • the weight ratio of the first part to the second part may be in a range from about 15: 1 to 1 : 1 , from about 10: 1 to 1 : 1 , or from about 5:1 to 1 : 1.
  • the first part comprises any of alkenyldialkyl terminated polydialkylsiloxane, alkenyldialkyl terminated polydialkylalkenylmethylsiloxane or mixtures thereof, which will individually or collectively have a viscosity of from 250 to lOOOOmPa.s at 25°C, and a hydrosilylation catalyst.
  • the alkenyl groups preferably have from 2 to 6 carbon atoms and typically are vinyl groups.
  • the second part comprises a mixture of organohydrogensiloxane having two Si-H bonds per molecule, which in some examples is a maximum of two Si-H bonds per molecule, and organohydrogensiloxane having at least three Si-H bonds per molecule.
  • the organo groups are alkyl groups such as methyl groups and ethyl groups, alternatively methyl groups.
  • the outer layer is the reaction product of a first part and a second part. In one example, the ratio of the first part to the second part is about 10:1.
  • the weight ratio of the first part to the second part may be in a range from about 15: 1 to 1 : 1 , from about 15: 1 to 5: 1 , or from about 13: 1 to 8: 1.
  • the first part comprises any of alkenyldialkyl terminated polydialkylsiloxane, alkenyldialkyl terminated polydialkylalkenylmethylsiloxane or mixtures thereof, which will individually or collectively have a viscosity of from 250 to lOOOOmPa.s at 25°C, and a hydrosilylation catalyst.
  • the alkenyl groups preferably have from 2 to 6 carbon atoms and typically are vinyl groups.
  • the second part comprises organohydrogensiloxane having at least two Si-H bonds per molecule and alkenylated MQ silicone resin, having at least two Si-alkenyl bonds per molecule.
  • the alkenyl group of the alkenylated MQ silicone resin comprises 2 to 6 carbon atom.
  • the alkenylated MQ silicone resin may comprise vinylated MQ resin.
  • the second part for each of the inner and outer layers also comprises any of alkenyldialkyl terminated polydialkylsiloxane, for example vinyldialkyl terminated polydialkylsiloxane, alkenyldialkyl terminated polydialkylalkenylmethylsiloxane, for example vinyldialkyl terminated polydialkylalkenylmethylsiloxane or mixtures thereof.
  • alkenyldialkyl terminated polydialkylsiloxane for example vinyldialkyl terminated polydialkylsiloxane
  • alkenyldialkyl terminated polydialkylalkenylmethylsiloxane for example vinyldialkyl terminated polydialkylalkenylmethylsiloxane or mixtures thereof.
  • MQ silicone resins defined herein M units typically have the formula R 1 R 2 R 3 SiOi/2, each of R 1 , R 2 and R 3 an alkyl group or an alkenyl group.
  • Each alkyl group generally has 1 to 6 carbon atoms, alternatively is a methyl group or an ethyl group, alternatively a methyl group.
  • Each alkenyl group has 2 to 6 carbon atom and is generally selected from a vinyl group or a hexenyl group.
  • R 1 , R 2 and R 3 will either be all alkyl groups or a mixture of alkyl and alkenyl groups.
  • An alkenylated M group will generally comprise two alkyl groups, e.g. methyl and one alkenyl group, e.g. vinyl.
  • Q units typically have the formula S1O4/2.
  • examples of the disclosure have a low thermal conductivity and exhibit the required mechanical properties, such as flexibility, even at high temperatures, for instance above 150 degrees centigrade.
  • the inner layer remains relatively soft and flexible whereas the outer layer may become brittle.
  • the inner layer provides mechanical damping to absorb stress/strain between the substrate and the outer layer, whereas the stiffer outer layer protects the inner layer from external conditions, such as seawater and hydrostatic pressure.
  • a first primer is provided between the inner layer and the structure and a second primer is provided between the inner and outer layers.
  • the first and second primers may have different compositions.
  • primer may be provided only between the inner layer and the structure or only between the inner and outer layers.
  • the inner layer comprises a syntactic medium.
  • the inner layer does not comprise a syntactic medium.
  • the syntactic medium may comprise microspheres.
  • the inner layer comprises about 2 to 6 % by weight microspheres, and may comprise about 4 % by weight microspheres.
  • the microspheres may be ceramic microspheres.
  • the outer layer also comprises a syntactic medium.
  • the syntactic medium may comprise microspheres.
  • the inner layer comprises about 2 to 6 % by weight microspheres, and may comprise about 4 % by weight microspheres.
  • the microspheres in the outer layer may be glass microspheres, and particularly may be borosilicate glass microspheres. In other examples, for instance, structures which are for use on substrates in deep water, for example 4000 m, which would need to withstand high pressures, the outer layer may not comprise a syntactic medium.
  • the inner and outer layers comprise filler. In other examples, only the inner layer or the outer layer may comprise filler.
  • the filler may be reinforcing filler, non-reinforcing filler or a mixture thereof.
  • the filler may be glass filler.
  • the inner layer has a thickness of about 5 to 50 mm, and may have a thickness of about 20 mm.
  • the outer layer has a thickness of about 10 to 250 mm.
  • Examples of the disclosure also provide a substrate for use subsea comprising a thermal insulation structure as described above.
  • the substrate is metal and may be, for instance, subsea oil and gas equipment such as wellheads and Xmas trees, spool pieces, manifolds, risers and pipe field joints.
  • an anticorrosion coating is provided on the substrate, and the anticorrosion coating may be an epoxy phenolic coating.
  • the anticorrosion coating may have a thickness of about 4 to 600 microns.
  • the primer is applied to the anticorrosion coating.
  • the inner layer may be applied directly to the anticorrosion coating.
  • Examples of the disclosure also provide a method of providing a thermal insulation structure for a substrate for use subsea, the method comprising providing a thermal insulation structure as described above.
  • the method includes the steps of forming the inner and outer layers separately by injection moulding.
  • the inner and outer layers may be applied to the substrate by injection moulding.
  • the respective first and second parts of the inner and outer layers would be mixed en route to the mould.
  • the respective mixtures of the first and second parts of the inner and outer layers may be ambient cured or may be cured at elevated temperatures, as required.
  • the inner layer may be hand applied in an uncured state, and particularly to substrates with a complex profile.
  • the thermal insulation structure may be constructed around or on a substrate by the sequential application of the inner and outer layers to the substrate.
  • a first primer may be applied to the substrate, or to the anticorrosion coating of the substrate. The first primer would then be allowed to cure.
  • the inner layer would then be applied to the cured first primer.
  • a second primer would then be applied to the inner layer. The second primer would then be allowed to cure.
  • the outer layer would then be applied to the cured second primer.
  • a vinyldimethyl terminated polydimethylsiloxane or vinyldimethyl terminated polydimethylvinylmethylsiloxane having a viscosity of from 250 to lOOOOmPa.s at 25°C in an amount of from 50 to 90% by weight of the composition. In other examples, the viscosity may be from 250 to lOOOmPa.s at 25°C.
  • Suitable hydrosilylation catalysts comprise platinum group metals (sometimes referred to as platinum metals) i.e. platinum, ruthenium, rhodium, palladium, osmium and iridium or complexes or compounds of a platinum group metal.
  • Preferred catalysts are platinum compounds or complexes including chloroplatinic acid, platinum acetylacetonate, complexes of platinous halides with unsaturated compounds, for example, ethylene, propylene, organovinylsiloxanes and styrene, hexamethyldiplatinum, PtC .PtC and Pt(CN)3.
  • One preferred catalyst (C) is Karstedt's catalyst, a coordination complex of platinum and divinyltetramethyldisiloxane produced by reaction of chloroplatinic acid and divinyltetramethyldisiloxane.
  • the catalyst may be a rhodium complex, for example, RhC (Bu2S)3.
  • the hydrosilylation catalyst (C) may for example be present in the composition at from 10 to 200 parts per million (ppm) by weight of a platinum group metal based on the total weight of the organopolysiloxane (A), such as from 30 to 150 ppm or from 50 or 80 ppm up to 120 ppm by weight of a platinum group metal.
  • One or more finely divided, reinforcing fillers such as high surface area fumed and precipitated silicas and/or additional non-reinforcing fillers such as crushed quartz, diatomaceous earths, barium sulphate, iron oxide, titanium dioxide and carbon black, talc, wollastonite.
  • Other fillers which might be used alone or in addition to the above include aluminite, calcium sulphate (anhydrite), gypsum, calcium sulphate, magnesium carbonate, clays such as kaolin, aluminium trihydroxide, magnesium hydroxide (brucite), graphite, copper carbonate, e.g. malachite, nickel carbonate, e.g.
  • zarachite barium carbonate, e.g. witherite and/or strontium carbonate e.g. strontianite.
  • Silica fillers are preferred.
  • the filler is treated for example with a fatty acid or a fatty acid ester such as a stearate, or with organosilanes, organosiloxanes, or organosilazanes e.g. hexaalkyl disilazane or short chain siloxane diols to render the filler(s) hydrophobic and therefore easier to handle and obtain a homogeneous mixture with the other sealant components
  • the surface treatment of the fillers makes the filler easily wetted by the silicone polymer.
  • a syntactic medium such as ceramic microspheres in the range of 2-
  • Second part 1) a vinyldimethyl terminated polydimethylsiloxane orvinyldimethyl terminated polydimethylvinylmethylsiloxane having a viscosity of from 250 to l OOOOmPa.s at 25°C in an amount of from 50 to 70% by weight of the composition. In other examples, the viscosity may be from 250 to l OOOmPa.s at 25°C.
  • organohydrogensiloxanes (i) and (ii) can contain, for example, from about 4-100 silicon atoms per molecule, and have a viscosity of from 5mPa.s at 25°C to about 10 Pa.s at 25°C.
  • the organohydrogensiloxanes (i) and (ii) may have terminal Si-H groups and/or pendent Si-H groups in the molecule.
  • the silicon-bonded organic groups present in the organohydrogensiloxane can include substituted and unsubstituted alkyl groups of 1 -4 carbon atoms that are otherwise free of ethylenic or acetylenic unsaturation.
  • “Substituted” means one or more hydrogen atoms in a hydrocarbon group has been replaced with another substituent.
  • substituents include, but are not limited to, halogen atoms such as chlorine, fluorine, bromine, and iodine; halogen atom containing groups such as chloromethyl, perfluorobutyl, trifluoroethyl, and nonafluorohexyl; oxygen atoms; oxygen atom containing groups such as (meth)acrylic and carboxyl; nitrogen atoms; nitrogen atom containing groups such as amino-functional groups, amido-functional groups, and cyano-functional groups; sulphur atoms; and sulphur atom containing groups such as mercapto groups.
  • organohydrogensiloxanes (i) and (ii) are generally present in an amount of from 2 to 20% by weight, alternatively 2 to 15% by weight of the total composition
  • the remainder is substantially made up of: 3)
  • One or more finely divided, reinforcing fillers such as high surface area fumed and precipitated silicas and/or additional non-reinforcing fillers such as crushed quartz, diatomaceous earths, barium sulphate, iron oxide, titanium dioxide and carbon black, talc, wollastonite.
  • Other fillers which might be used alone or in addition to the above include aluminite, calcium sulphate (anhydrite), gypsum, calcium sulphate, magnesium carbonate, clays such as kaolin, aluminium trihydroxide, magnesium hydroxide (brucite), graphite, copper carbonate, e.g. malachite, nickel carbonate, e.g.
  • zarachite barium carbonate, e.g. witherite and/or strontium carbonate e.g. strontianite and/or silicone resins such as vinylated MQ resins wherein Q units typically have the formula S1O4/2 and M units typically having the formula R 1 R 2 R 3 SiOi/2 as hereinbefore described which M groups contain at least one alkenyl group.
  • Silica fillers are preferred. Generally the filler is treated for example with a fatty acid or a fatty acid ester such as a stearate, or with organosilanes, organosiloxanes, or organosilazanes e.g.
  • hexaalkyl disilazane or short chain siloxane diols to render the filler(s) hydrophobic and therefore easier to handle and obtain a homogeneous mixture with the other sealant components
  • the surface treatment of the fillers makes the filler easily wetted by the silicone polymer.
  • one or more cure inhibitor(s) may be introduced, which may be any suitable hydrosilylation inhibitor, these may be selected from, for example, acetylenic compounds, e.g. acetylenic alcohols, ethylenically unsaturated isocyanates, acetylenically unsaturated silanes and unsaturated dicarboxylic acid diesters or a maleate compound such as a bismaleate or a diallylmaleate, or a mixture thereof.
  • acetylenic compounds e.g. acetylenic alcohols, ethylenically unsaturated isocyanates, acetylenically unsaturated silanes and unsaturated dicarboxylic acid diesters or a maleate compound such as a bismaleate or a diallylmaleate, or a mixture thereof.
  • a syntactic medium such as ceramic microspheres in the range of 2-6%
  • the first part and the second part are mixed together immediately prior to use in a weight ratio of about 1 :1.
  • the first part is a cure package part and the second part is a base part.
  • Suitable hydrosilylation catalysts comprise platinum group metals (sometimes referred to as platinum metals) i.e. platinum, ruthenium, rhodium, palladium, osmium and iridium or complexes or compounds of a platinum group metal.
  • Preferred catalysts are platinum compounds or complexes including chloroplatinic acid, platinum acetylacetonate, complexes of platinous halides with unsaturated compounds, for example, ethylene, propylene, organovinylsiloxanes and styrene, hexamethyldiplatinum, PtC .PtC and Pt(CN)3.
  • One preferred catalyst (C) is Karstedt's catalyst, a coordination complex of platinum and divinyltetramethyldisiloxane produced by reaction of chloroplatinic acid and divinyltetramethyldisiloxane.
  • the catalyst may be a rhodium complex, for example, RhC (Bu2S)3.
  • the hydrosilylation catalyst (C) may for example be present in the composition at from 10 to 200 parts per million (ppm) by weight of a platinum group metal based on the total weight of the organopolysiloxane (A), such as from 30 to 150 ppm or from 50 or 80 ppm up to 120 ppm by weight of a platinum group metal.
  • a platinum group metal based on the total weight of the organopolysiloxane (A), such as from 30 to 150 ppm or from 50 or 80 ppm up to 120 ppm by weight of a platinum group metal.
  • One or more finely divided, reinforcing fillers such as high surface area fumed and precipitated silicas and/or additional non-reinforcing fillers such as crushed quartz, diatomaceous earths, barium sulphate, iron oxide, titanium dioxide and carbon black, talc, wollastonite.
  • fillers which might be used alone or in addition to the above include aluminite, calcium sulphate (anhydrite), gypsum, calcium sulphate, magnesium carbonate, clays such as kaolin, aluminium trihydroxide, magnesium hydroxide (brucite), graphite, copper carbonate, e.g. malachite, nickel carbonate, e.g. zarachite, barium carbonate, e.g. witherite and/or strontium carbonate e.g.
  • strontianite and/or silicone resins such as vinylated MQ resins wherein Q units typically have the formula S1O4/2 and M units typically having the formula R 1 R 2 R 3 SiOi/2 as hereinbefore described, each of which M groups contain at least one alkenyl group.
  • Silica fillers and/or MQ resins as described above are preferred. Generally silica fillers are treated for example with a fatty acid or a fatty acid ester such as a stearate, or with organosilanes, organosiloxanes, or organosilazanes e.g.
  • hexaalkyl disilazane or short chain siloxane diols to render the filler(s) hydrophobic and therefore easier to handle and obtain a homogeneous mixture with the other sealant components
  • the surface treatment of the fillers makes the filler easily wetted by the silicone polymer.
  • syntactic medium such as microspheres in the range of 2-6% Second part
  • One or more linear and/or cyclic methylhydrogensiloxanes each of which having two or more silicon bonded hydrogen atoms per molecule and/or one or more MQ resins where M and Q are as defined above but containing at least 2 Si-H bonds per molecule.
  • the methylhydrogensiloxane can contain, for example, from about 4-100 silicon atoms per molecule, and have a viscosity of from 5mPa's at 25°C to about 10 Pa.s at 25°C.
  • the one or more linear and/or cyclic methylhydrogensiloxanes may have terminal Si-H groups and/or pendent Si-H groups in the molecule.
  • Said organohydrogensiloxanes are generally present in an amount of from 25 to 50% by weight, alternatively 30 to 50% by weight of the total composition
  • a pigment may be added.
  • the first part and the second part are mixed together immediately prior to use in a weight ratio of about 10:1 first part to second part.
  • a UV tracer may be added.
  • the first part is a base part and the second part is a cure package part.
  • R 4 is an unsaturated silicon-bonded organic group such as hydrocarbyl groups which are alkenyl groups (for example vinyl and allyl) and alkynyl groups.
  • R 7 is an alkoxy group having from 1 to 6 carbon atoms c) R 5 pSi-(OR 6 ) 4 .p where p may be 0, 1 or 2 preferably p is 0 or 1 R 5 may be a non-hydrolysable silicon-bonded organic group such as hydrocarbyl groups which are optionally substituted by halogen such as fluorine and chlorine.
  • Examples include alkyl groups (for example methyl, ethyl, propyl, and butyl); cycloalkyl groups (for example cyclopentyl and cyclohexyl); alkenyl groups (for example vinyl and allyl); aryl groups (for example phenyl, and tolyl); aralkyi groups (for example 2-phenylethyl) and groups obtained by replacing all or part of the hydrogen in the preceding organic groups with halogen.
  • the fourth silicon- bonded organic groups is methyl.
  • R 6 is an alkoxy group having from 1 to 6 carbon atoms
  • R 8 include but are not restricted to methyl, ethyl, propyl, isopropyl, butyl, tertiary butyl and a branched secondary alkyl group such as 2,4- dimethyl-3-pentyl.
  • R 8 is an isopropyl, branched secondary alkyl group or a tertiary alkyl group, in particular, tertiary butyl.
  • An example composition of a second primer provided between the inner and outer layers a) A linear polydialkylsiloxane having from 3 to 15 silicon atoms, alternatively 3 to 10 silicon atoms. Each alkyl group may be the same or different and may comprise from 1 to 6 carbon atoms. b) R n Si -(OR 9 ) 4 -n where n may be 0, 1 or 2 preferably n is 0 or 1.
  • R may be a non-hydrolysable silicon-bonded organic group such as hydrocarbyl groups.
  • examples include alkyl groups (for example methyl, ethyl, propyl, and butyl); cycloalkyl groups (for example cyclopentyl and cyclohexyl); alkenyl groups (for example vinyl and allyl); aryl groups (for example phenyl, and tolyl); aralkyi groups (for example 2-phenylethyl) and groups obtained by replacing all or part of the hydrogen in the preceding organic groups with halogen.
  • the fourth silicon-bonded organic groups is methyl.
  • Each R 9 is the same or different and is an alkoxy group having from 1 to 6 carbon atoms c) A Titanate of the general formula Ti[OR 2 ] 4 where each R 2 may be the same or different and represents a monovalent, primary, secondary or tertiary aliphatic hydrocarbon group which may be linear or branched containing from 1 to 10 carbon atoms. Optionally the titanate may contain partially unsaturated groups.
  • R 2 include but are not restricted to methyl, ethyl, propyl, isopropyl, butyl, tertiary butyl and a branched secondary alkyl group such as 2,4- dimethyl-3-pentyl.
  • R 2 is an isopropyl, branched secondary alkyl group or a tertiary alkyl group, in particular, tertiary butyl.
  • R n Si -(OR 3 ) 4 -n n may be 0, 1 or 2 preferably n is 0 or 1.
  • R may be a non-hydrolysable silicon-bonded organic group such as hydrocarbyl groups
  • examples include alkyl groups (for example methyl, ethyl, propyl, and butyl); cycloalkyi groups (for example cyclopentyl and cyclohexyl); alkenyl groups (for example vinyl and allyl); aryl groups (for example phenyl, and tolyl); aralkyl groups (for example 2-phenylethyl) and groups obtained by replacing all or part of the hydrogen in the preceding organic groups with halogen.
  • the fourth silicon-bonded organic groups is methyl.
  • Each R 3 is the same or different and is an alkoxy group having from 1 to 6 carbon atoms or an alkoxyalkylene group in which the alkoxy group has from 1 to 6 carbon atoms and the alkylene chain has from 1 to 6 carbon atoms.
  • example or “for example” or “may” in the text denotes, whether explicitly stated or not, that such features or functions are present in at least the described example, whether described as an example or not, and that they can be, but are not necessarily, present in some of or all other examples.
  • example “for example” or “may” refers to a particular instance in a class of examples.
  • a property of the instance can be a property of only that instance or a property of the class or a property of a sub-class of the class that includes some but not all of the instances in the class.

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Abstract

La présente invention concerne une structure d'isolation thermique pour un substrat destinée à une utilisation sous-marine, et un procédé de fourniture d'une structure d'isolation thermique. La structure comprend : une couche interne et une couche externe. La couche interne est le produit réactionnel d'une première partie et d'une seconde partie, le rapport en poids de la première partie à la seconde partie est d'environ 15:1 à 1:1. La première partie comprend l'un quelconque d'un polydialkylsiloxane terminé par un groupe alcényldialkyle, d'un polydialkylalcénylméthylsiloxane terminé par un groupe alcényldialkyle ou de leurs mélanges, qui auront individuellement ou collectivement une viscosité de 250 à 10 000 mPa•s à 25 °C, et un catalyseur d'hydrosilylation. La seconde partie comprend un mélange d'organohydrogénosiloxane ayant deux liaisons Si-H par molécule et d'organohydrogénosiloxane ayant au moins trois liaisons Si-H par molécule. La couche externe est le produit réactionnel d'une première partie et d'une seconde partie, le rapport en poids de la première partie à la seconde partie étant d'environ 15:1 à 1:1. La première partie comprend l'un quelconque d'un polydialkylsiloxane terminé par un groupe alcényldialkyle, d'un polydialkylalcénylméthylsiloxane terminé par un groupe alcényldialkyle ou de leurs mélanges, qui auront individuellement ou collectivement une viscosité de 250 à 10 000 mPa•s à 25 °C, et un catalyseur d'hydrosilylation. La seconde partie comprend un organohydrogénosiloxane ayant au moins deux liaisons Si-H par molécule et de la résine de silicone MQ alcénylée, ledit groupe M comprenant au moins deux liaisons Si-alcényle par molécule.The present invention relates to a thermal insulation structure for a substrate for underwater use, and a method for providing a thermal insulation structure. The structure comprises: an inner layer and an outer layer. The inner layer is the reaction product of a first portion and a second portion, the weight ratio of the first portion to the second portion is about 15: 1 to 1: 1. The first part comprises any one of an alkenyl dialkyl terminated polydialkylsiloxane, an alkenyl dialkyl terminated polydialkylalkenylmethylsiloxane, or mixtures thereof, which will individually or collectively have a viscosity of 250 to 10,000 mPa · s at 25 °. C, and a hydrosilylation catalyst. The second part comprises a mixture of organohydrogensiloxane having two Si-H bonds per molecule and organohydrogensiloxane having at least three Si-H bonds per molecule. The outer layer is the reaction product of a first portion and a second portion, the weight ratio of the first portion to the second portion being about 15: 1 to 1: 1. The first part comprises any one of an alkenyl dialkyl terminated polydialkylsiloxane, an alkenyl dialkyl terminated polydialkylalkenylmethylsiloxane, or mixtures thereof, which will individually or collectively have a viscosity of 250 to 10,000 mPa · s at 25 °. C, and a hydrosilylation catalyst. The second part comprises an organohydrogensiloxane having at least two Si-H bonds per molecule and alkenyl MQ silicone resin, said M group comprising at least two Si-alkenyl bonds per molecule.

Description

TITLE
Thermal Insulation Structure TECHNOLOGICAL FIELD
Examples of the disclosure relate to a thermal insulation structure, and particularly a thermal insulation structure for a substrate for use subsea. BACKGROUND
The application of thermal insulation to subsea oil and gas equipment to maintain the temperature of the extracted fluids as they pass through portions of the equipment exposed to the cooling effects of sea water is known. Items of subsea equipment which benefit from thermal insulation include: wellheads and Xmas trees, spool pieces, manifolds, risers and pipe field joints.
Thermal insulation must have a low thermal conductivity and exhibit the required mechanical properties, such as flexibility. At high temperatures, for instance above 150 degrees centigrade, known thermal insulation can become brittle leading to a deterioration or loss of the required mechanical properties, such as flexibility.
There is a requirement therefore for thermal insulation which has a low thermal conductivity and exhibits the required mechanical properties, such as flexibility, even at high temperatures, for example, above 150 degrees centigrade.
All proportions in this specification are expressed as weight percentages.
BRIEF SUMMARY
According to various, but not necessarily all, examples of the disclosure there is provided a thermal insulation structure for a substrate for use subsea, the structure comprising: an inner layer and an outer layer; the inner layer being the reaction product of a first part and a second part, wherein the weight ratio of the first part to the second part is from about 15: 1 to 1 : 1 , the first part comprises any of alkenyldialkyl terminated polydialkylsiloxane, alkenyldialkyl terminated polydialkylalkenylmethylsiloxane or mixtures thereof, which will individually or collectively have a viscosity of from 250 to l OOOOmPa.s at 25°C, and a hydrosilylation catalyst, wherein the second part comprises a mixture of organohydrogensiloxane having two Si-H bonds per molecule and organohydrogensiloxane having at least three Si-H bonds per molecule; the outer layer being the reaction product of a first part and a second part, wherein the weight ratio of the first part to the second part is from about 15:1 to 1 :1 , the first part comprises any of alkenyldialkyl terminated polydialkylsiloxane, alkenyldialkyl terminated polydialkylalkenylmethylsiloxane or mixtures thereof, which will individually or collectively have a viscosity of from 250 to l OOOOmPa.s at 25°C, and a hydrosilylation catalyst, wherein the second part comprises organohydrogensiloxane having at least two Si-H bonds per molecule and alkenylated MQ silicone resin, having at least two Si-alkenyl bonds per molecule. The weight ratio of the first part to the second part for the inner layer may be from about 10: 1 to 1 : 1 , or may be from about 5: 1 to 1 : 1 , or may be about 1 : 1.
The weight ratio of the first part to the second part for the outer layer may be from about 15: 1 to 1 : 1 or may be about 15: 1 to 5: 1 , or may be from about 13: 1 to 8: 1 , or may be about 10: 1.
The second part of the inner layer may comprise a mixture of an organohydrogensiloxane having a maximum of two Si-H bonds per molecule and an organohydrogensiloxane having at least three Si-H bonds per molecule. The organo groups may be any suitable organic group but is typically an alkyl group having from 1 to 6 carbon atoms, alternatively methyl or ethyl groups, alternatively methyl groups.
The second part for each of the inner and outer layers may comprise any of alkenyldialkyl terminated polydialkylsiloxane, alkenyldialkyl terminated polydialkylalkenylmethylsiloxane or mixtures thereof. The alkenyl groups may be any suitable alkenyl group but typically have from 2 to 6 carbon atoms, alternatively the alkenyl groups are vinyl and/or hexenyl groups but typically all alkenyl groups are vinyl groups. The alkenyl group of the alkenylated MQ silicone resin may comprise 2 to 6 carbon atoms . The alkenylated MQ silicone resin may comprise vinylated MQ resin.
The silicon-bonded alkyl groups and/or organic groups as described herein can include substituted and unsubstituted alkyl groups of 1-6 carbon atoms that are otherwise free of ethylenic or acetylenic unsaturation. For the purpose of this application "Substituted" means one or more hydrogen atoms in a hydrocarbon group has been replaced with another substituent. Examples of such substituents include, but are not limited to, halogen atoms such as chlorine, fluorine, bromine, and iodine; halogen atom containing groups such as chloromethyl, perfluorobutyl, trifluoroethyl, and nonafluorohexyl; oxygen atoms; oxygen atom containing groups such as
(meth)acrylic and carboxyl; nitrogen atoms; nitrogen atom containing groups such as amino-functional groups, amido-functional groups, and cyano-functional groups; sulphur atoms; and sulphur atom containing groups such as mercapto groups.
Typically when organohydrogensiloxanes having two silicon bonded hydrogen atoms per molecule are present they will be used in a mixture with organohydrogensiloxane having more than two silicon bonded hydrogen atoms per molecule.
A first primer may be provided between the inner layer and the substrate. A second primer may be provided between the inner and outer layers. The first and second primers may have different compositions.
The inner layer may comprise a syntactic medium. The syntactic medium may comprise microspheres. The microspheres may comprise ceramic microspheres. The inner layer may comprise about 2 to 6 % by weight microspheres, and may comprise about 4 % by weight microspheres.
The outer layer may comprise a syntactic medium. The syntactic medium may comprise microspheres. The microspheres may comprise glass microspheres. The microspheres may comprise borosilicate glass microspheres. The outer layer may comprise about 2 to 6 % by weight microspheres, and may comprise about 4 % by weight microspheres.
The inner layer may comprise filler. The outer layer may comprise filler. The filler may be reinforcing filler, non-reinforcing filler or a mixture thereof. The inner layer may have a thickness of about 5 to 50 mm, and may have a thickness of about 20 mm. The outer layer may have a thickness of about 10 to 250 mm.
According to various, but not necessarily all, examples of the disclosure there is provided a substrate for use subsea comprising a thermal insulation structure according to any of the preceding eleven paragraphs. The substrate may be metal. An anticorrosion coating may be provided on the substrate. The anticorrosion coating may be an epoxy phenolic coating.
According to various, but not necessarily all, examples of the disclosure there is provided a method of providing a thermal insulation structure for a substrate for use subsea, the method comprising: providing a structure comprising: an inner layer and an outer layer; the inner layer being the reaction product of first and second parts, wherein the weight ratio of the first part to the second part is from about 15: 1 to 1 : 1 , the first part comprises any of alkenyldialkyl terminated polydialkylsiloxane, alkenyldialkyl terminated polydialkylalkenylmethylsiloxane or mixtures thereof, which will individually or collectively have a viscosity of from 250 to lOOOOmPa.s at 25°C, and a hydrosilylation catalyst, wherein the second part comprises a mixture of organohydrogensiloxane having two Si-H bonds per molecule and organohydrogensiloxane having at least three Si-H bonds per molecule; the outer layer being the reaction product of first and second parts, wherein the weight ratio of the first part to the second part is from about 15: 1 to 1 : 1 , the first part comprises any of alkenyldialkyl terminated polydialkylsiloxane, alkenyldialkyl terminated polydialkylalkenylmethylsiloxane or mixtures thereof, which will individually or collectively have a viscosity of from 250 to l OOOOmPa.s at 25°C, and a hydrosilylation catalyst, wherein the second part comprises organohydrogensiloxane having at least two Si-H bonds per molecule and alkenylated MQ silicone resin having at least two Si-alkenyl bonds per molecule.
According to various, but not necessarily all, examples of the disclosure there may be provided examples as claimed in the appended claims. DETAILED DESCRIPTION
Examples of the disclosure provide a thermal insulation structure, and particularly a thermal insulation structure for a substrate for use in subsea applications.
The substrate may be, for instance, subsea oil and gas equipment. The thermal insulation structure maintains the temperature of the extracted fluids as they pass through portions of the equipment exposed to the cooling effects of sea water. Items of subsea equipment which benefit from thermal insulation include: wellheads and Xmas trees, spool pieces, manifolds, risers and pipe field joints.
The thermal insulation structure comprises an inner layer and an outer layer.
The inner layer is the reaction product of a first part and a second part. In one example, the ratio of the first part to the second part is about 1 :1. However, in other examples, the weight ratio of the first part to the second part may be in a range from about 15: 1 to 1 : 1 , from about 10: 1 to 1 : 1 , or from about 5:1 to 1 : 1. The first part comprises any of alkenyldialkyl terminated polydialkylsiloxane, alkenyldialkyl terminated polydialkylalkenylmethylsiloxane or mixtures thereof, which will individually or collectively have a viscosity of from 250 to lOOOOmPa.s at 25°C, and a hydrosilylation catalyst. As hereinbefore described the alkenyl groups preferably have from 2 to 6 carbon atoms and typically are vinyl groups.
The second part comprises a mixture of organohydrogensiloxane having two Si-H bonds per molecule, which in some examples is a maximum of two Si-H bonds per molecule, and organohydrogensiloxane having at least three Si-H bonds per molecule. As hereinbefore described the organo groups are alkyl groups such as methyl groups and ethyl groups, alternatively methyl groups. The outer layer is the reaction product of a first part and a second part. In one example, the ratio of the first part to the second part is about 10:1. However, in other examples, the weight ratio of the first part to the second part may be in a range from about 15: 1 to 1 : 1 , from about 15: 1 to 5: 1 , or from about 13: 1 to 8: 1. The first part comprises any of alkenyldialkyl terminated polydialkylsiloxane, alkenyldialkyl terminated polydialkylalkenylmethylsiloxane or mixtures thereof, which will individually or collectively have a viscosity of from 250 to lOOOOmPa.s at 25°C, and a hydrosilylation catalyst. As hereinbefore described the alkenyl groups preferably have from 2 to 6 carbon atoms and typically are vinyl groups.
The second part comprises organohydrogensiloxane having at least two Si-H bonds per molecule and alkenylated MQ silicone resin, having at least two Si-alkenyl bonds per molecule. In some examples, the alkenyl group of the alkenylated MQ silicone resin comprises 2 to 6 carbon atom. The alkenylated MQ silicone resin may comprise vinylated MQ resin.
In some examples, the second part for each of the inner and outer layers also comprises any of alkenyldialkyl terminated polydialkylsiloxane, for example vinyldialkyl terminated polydialkylsiloxane, alkenyldialkyl terminated polydialkylalkenylmethylsiloxane, for example vinyldialkyl terminated polydialkylalkenylmethylsiloxane or mixtures thereof. With respect to MQ silicone resins defined herein, M units typically have the formula R1 R2 R3SiOi/2, each of R1 , R2 and R3an alkyl group or an alkenyl group. Each alkyl group generally has 1 to 6 carbon atoms, alternatively is a methyl group or an ethyl group, alternatively a methyl group. Each alkenyl group has 2 to 6 carbon atom and is generally selected from a vinyl group or a hexenyl group. R1 , R2 and R3 will either be all alkyl groups or a mixture of alkyl and alkenyl groups. An alkenylated M group will generally comprise two alkyl groups, e.g. methyl and one alkenyl group, e.g. vinyl. Q units typically have the formula S1O4/2.
Advantageously, examples of the disclosure have a low thermal conductivity and exhibit the required mechanical properties, such as flexibility, even at high temperatures, for instance above 150 degrees centigrade. At such high temperatures, the inner layer remains relatively soft and flexible whereas the outer layer may become brittle. Accordingly, the inner layer provides mechanical damping to absorb stress/strain between the substrate and the outer layer, whereas the stiffer outer layer protects the inner layer from external conditions, such as seawater and hydrostatic pressure.
In some examples, a first primer is provided between the inner layer and the structure and a second primer is provided between the inner and outer layers. The first and second primers may have different compositions. In other examples, primer may be provided only between the inner layer and the structure or only between the inner and outer layers. In some examples, the inner layer comprises a syntactic medium. In other examples, the inner layer does not comprise a syntactic medium. The syntactic medium may comprise microspheres. In such examples, the inner layer comprises about 2 to 6 % by weight microspheres, and may comprise about 4 % by weight microspheres. The microspheres may be ceramic microspheres.
In some examples, the outer layer also comprises a syntactic medium. The syntactic medium may comprise microspheres. In such examples, the inner layer comprises about 2 to 6 % by weight microspheres, and may comprise about 4 % by weight microspheres. The microspheres in the outer layer may be glass microspheres, and particularly may be borosilicate glass microspheres. In other examples, for instance, structures which are for use on substrates in deep water, for example 4000 m, which would need to withstand high pressures, the outer layer may not comprise a syntactic medium. In some examples the inner and outer layers comprise filler. In other examples, only the inner layer or the outer layer may comprise filler. The filler may be reinforcing filler, non-reinforcing filler or a mixture thereof. The filler may be glass filler.
In examples of the disclosure, the inner layer has a thickness of about 5 to 50 mm, and may have a thickness of about 20 mm. The outer layer has a thickness of about 10 to 250 mm.
Examples of the disclosure also provide a substrate for use subsea comprising a thermal insulation structure as described above. In some examples, the substrate is metal and may be, for instance, subsea oil and gas equipment such as wellheads and Xmas trees, spool pieces, manifolds, risers and pipe field joints.
In some examples, an anticorrosion coating is provided on the substrate, and the anticorrosion coating may be an epoxy phenolic coating. The anticorrosion coating may have a thickness of about 4 to 600 microns. In examples where a primer is provided between the inner layer and the structure, the primer is applied to the anticorrosion coating. In other example, the inner layer may be applied directly to the anticorrosion coating.
Examples of the disclosure also provide a method of providing a thermal insulation structure for a substrate for use subsea, the method comprising providing a thermal insulation structure as described above. In some examples, the method includes the steps of forming the inner and outer layers separately by injection moulding. The inner and outer layers may be applied to the substrate by injection moulding. In such examples, the respective first and second parts of the inner and outer layers would be mixed en route to the mould. The respective mixtures of the first and second parts of the inner and outer layers may be ambient cured or may be cured at elevated temperatures, as required.
In other examples, the inner layer may be hand applied in an uncured state, and particularly to substrates with a complex profile.
The thermal insulation structure may be constructed around or on a substrate by the sequential application of the inner and outer layers to the substrate. In some examples, a first primer may be applied to the substrate, or to the anticorrosion coating of the substrate. The first primer would then be allowed to cure. The inner layer would then be applied to the cured first primer. A second primer would then be applied to the inner layer. The second primer would then be allowed to cure. The outer layer would then be applied to the cured second primer.
An example composition of the first and second parts of the inner layer First part
1) a vinyldimethyl terminated polydimethylsiloxane or vinyldimethyl terminated polydimethylvinylmethylsiloxane having a viscosity of from 250 to lOOOOmPa.s at 25°C in an amount of from 50 to 90% by weight of the composition. In other examples, the viscosity may be from 250 to lOOOmPa.s at 25°C.
2) Suitable hydrosilylation catalysts (C) comprise platinum group metals (sometimes referred to as platinum metals) i.e. platinum, ruthenium, rhodium, palladium, osmium and iridium or complexes or compounds of a platinum group metal. Preferred catalysts are platinum compounds or complexes including chloroplatinic acid, platinum acetylacetonate, complexes of platinous halides with unsaturated compounds, for example, ethylene, propylene, organovinylsiloxanes and styrene, hexamethyldiplatinum, PtC .PtC and Pt(CN)3. One preferred catalyst (C) is Karstedt's catalyst, a coordination complex of platinum and divinyltetramethyldisiloxane produced by reaction of chloroplatinic acid and divinyltetramethyldisiloxane. Alternatively the catalyst may be a rhodium complex, for example, RhC (Bu2S)3. The hydrosilylation catalyst (C) may for example be present in the composition at from 10 to 200 parts per million (ppm) by weight of a platinum group metal based on the total weight of the organopolysiloxane (A), such as from 30 to 150 ppm or from 50 or 80 ppm up to 120 ppm by weight of a platinum group metal.
The remainder is made up of: 3) One or more finely divided, reinforcing fillers such as high surface area fumed and precipitated silicas and/or additional non-reinforcing fillers such as crushed quartz, diatomaceous earths, barium sulphate, iron oxide, titanium dioxide and carbon black, talc, wollastonite. Other fillers which might be used alone or in addition to the above include aluminite, calcium sulphate (anhydrite), gypsum, calcium sulphate, magnesium carbonate, clays such as kaolin, aluminium trihydroxide, magnesium hydroxide (brucite), graphite, copper carbonate, e.g. malachite, nickel carbonate, e.g. zarachite, barium carbonate, e.g. witherite and/or strontium carbonate e.g. strontianite. Silica fillers are preferred. Generally the filler is treated for example with a fatty acid or a fatty acid ester such as a stearate, or with organosilanes, organosiloxanes, or organosilazanes e.g. hexaalkyl disilazane or short chain siloxane diols to render the filler(s) hydrophobic and therefore easier to handle and obtain a homogeneous mixture with the other sealant components The surface treatment of the fillers makes the filler easily wetted by the silicone polymer. 4) Optionally a syntactic medium such as ceramic microspheres in the range of 2-
6%
Second part 1) a vinyldimethyl terminated polydimethylsiloxane orvinyldimethyl terminated polydimethylvinylmethylsiloxane having a viscosity of from 250 to l OOOOmPa.s at 25°C in an amount of from 50 to 70% by weight of the composition. In other examples, the viscosity may be from 250 to l OOOmPa.s at 25°C.
2) A mixture of:
(i) linear, branched and/or cyclic organohydrogensiloxanes each having two silicon bonded hydrogen atoms per molecule and (ii) linear, branched and/or cyclic organohydrogensiloxanes each having three or more silicon bonded hydrogen atoms per molecule. The organohydrogensiloxanes (i) and (ii) can contain, for example, from about 4-100 silicon atoms per molecule, and have a viscosity of from 5mPa.s at 25°C to about 10 Pa.s at 25°C. The organohydrogensiloxanes (i) and (ii) may have terminal Si-H groups and/or pendent Si-H groups in the molecule. The silicon-bonded organic groups present in the organohydrogensiloxane can include substituted and unsubstituted alkyl groups of 1 -4 carbon atoms that are otherwise free of ethylenic or acetylenic unsaturation. For the purpose of this application "Substituted" means one or more hydrogen atoms in a hydrocarbon group has been replaced with another substituent. Examples of such substituents include, but are not limited to, halogen atoms such as chlorine, fluorine, bromine, and iodine; halogen atom containing groups such as chloromethyl, perfluorobutyl, trifluoroethyl, and nonafluorohexyl; oxygen atoms; oxygen atom containing groups such as (meth)acrylic and carboxyl; nitrogen atoms; nitrogen atom containing groups such as amino-functional groups, amido-functional groups, and cyano-functional groups; sulphur atoms; and sulphur atom containing groups such as mercapto groups. In total said organohydrogensiloxanes (i) and (ii) are generally present in an amount of from 2 to 20% by weight, alternatively 2 to 15% by weight of the total composition
The remainder is substantially made up of: 3) One or more finely divided, reinforcing fillers such as high surface area fumed and precipitated silicas and/or additional non-reinforcing fillers such as crushed quartz, diatomaceous earths, barium sulphate, iron oxide, titanium dioxide and carbon black, talc, wollastonite. Other fillers which might be used alone or in addition to the above include aluminite, calcium sulphate (anhydrite), gypsum, calcium sulphate, magnesium carbonate, clays such as kaolin, aluminium trihydroxide, magnesium hydroxide (brucite), graphite, copper carbonate, e.g. malachite, nickel carbonate, e.g. zarachite, barium carbonate, e.g. witherite and/or strontium carbonate e.g. strontianite and/or silicone resins such as vinylated MQ resins wherein Q units typically have the formula S1O4/2 and M units typically having the formula R1 R2 R3SiOi/2 as hereinbefore described which M groups contain at least one alkenyl group. Silica fillers are preferred. Generally the filler is treated for example with a fatty acid or a fatty acid ester such as a stearate, or with organosilanes, organosiloxanes, or organosilazanes e.g. hexaalkyl disilazane or short chain siloxane diols to render the filler(s) hydrophobic and therefore easier to handle and obtain a homogeneous mixture with the other sealant components The surface treatment of the fillers makes the filler easily wetted by the silicone polymer.
4) Optionally one or more cure inhibitor(s) may be introduced, which may be any suitable hydrosilylation inhibitor, these may be selected from, for example, acetylenic compounds, e.g. acetylenic alcohols, ethylenically unsaturated isocyanates, acetylenically unsaturated silanes and unsaturated dicarboxylic acid diesters or a maleate compound such as a bismaleate or a diallylmaleate, or a mixture thereof. 5) Optionally a syntactic medium such as ceramic microspheres in the range of 2-6%
In one example, the first part and the second part are mixed together immediately prior to use in a weight ratio of about 1 :1. The first part is a cure package part and the second part is a base part.
An example composition of the first and second parts of the outer layer
First part
1 ) One or more vinyldimethyl terminated polydimethylsiloxane or vinyldimethyl terminated polydimethylvinylmethylsiloxane having a viscosity of from 250 to "lOOOOmPa.s at 25°C in an amount of from 50 to 90% by weight of the composition. In other examples, the viscosity may be from 250 to lOOOmPa.s at 25°C. ) Suitable hydrosilylation catalysts (C) comprise platinum group metals (sometimes referred to as platinum metals) i.e. platinum, ruthenium, rhodium, palladium, osmium and iridium or complexes or compounds of a platinum group metal. Preferred catalysts are platinum compounds or complexes including chloroplatinic acid, platinum acetylacetonate, complexes of platinous halides with unsaturated compounds, for example, ethylene, propylene, organovinylsiloxanes and styrene, hexamethyldiplatinum, PtC .PtC and Pt(CN)3. One preferred catalyst (C) is Karstedt's catalyst, a coordination complex of platinum and divinyltetramethyldisiloxane produced by reaction of chloroplatinic acid and divinyltetramethyldisiloxane. Alternatively the catalyst may be a rhodium complex, for example, RhC (Bu2S)3. The hydrosilylation catalyst (C) may for example be present in the composition at from 10 to 200 parts per million (ppm) by weight of a platinum group metal based on the total weight of the organopolysiloxane (A), such as from 30 to 150 ppm or from 50 or 80 ppm up to 120 ppm by weight of a platinum group metal. ) One or more finely divided, reinforcing fillers such as high surface area fumed and precipitated silicas and/or additional non-reinforcing fillers such as crushed quartz, diatomaceous earths, barium sulphate, iron oxide, titanium dioxide and carbon black, talc, wollastonite. Other fillers which might be used alone or in addition to the above include aluminite, calcium sulphate (anhydrite), gypsum, calcium sulphate, magnesium carbonate, clays such as kaolin, aluminium trihydroxide, magnesium hydroxide (brucite), graphite, copper carbonate, e.g. malachite, nickel carbonate, e.g. zarachite, barium carbonate, e.g. witherite and/or strontium carbonate e.g. strontianite and/or silicone resins such as vinylated MQ resins wherein Q units typically have the formula S1O4/2 and M units typically having the formula R1 R2 R3SiOi/2 as hereinbefore described, each of which M groups contain at least one alkenyl group. Silica fillers and/or MQ resins as described above are preferred. Generally silica fillers are treated for example with a fatty acid or a fatty acid ester such as a stearate, or with organosilanes, organosiloxanes, or organosilazanes e.g. hexaalkyl disilazane or short chain siloxane diols to render the filler(s) hydrophobic and therefore easier to handle and obtain a homogeneous mixture with the other sealant components The surface treatment of the fillers makes the filler easily wetted by the silicone polymer.
4) Optionally a syntactic medium such as microspheres in the range of 2-6% Second part
1) One or more vinyldimethyl terminated polydimethylsiloxane or vinyldimethyl terminated polydimethylvinylmethylsiloxane having a viscosity of from 250 to l OOOOmPa.s at 25°C in an amount of from 50 to 90% by weight of the composition. In other examples, the viscosity may be from 250 to lOOOmPa.s at 25°C.
2) One or more linear and/or cyclic methylhydrogensiloxanes each of which having two or more silicon bonded hydrogen atoms per molecule and/or one or more MQ resins where M and Q are as defined above but containing at least 2 Si-H bonds per molecule. The methylhydrogensiloxane can contain, for example, from about 4-100 silicon atoms per molecule, and have a viscosity of from 5mPa's at 25°C to about 10 Pa.s at 25°C. The one or more linear and/or cyclic methylhydrogensiloxanes may have terminal Si-H groups and/or pendent Si-H groups in the molecule.
Said organohydrogensiloxanes are generally present in an amount of from 25 to 50% by weight, alternatively 30 to 50% by weight of the total composition
The remainder is made up of:
3) One or more vinylated MQ resins wherein Q units typically have the formula Si04/2 and M units typically having the formula R1 R2 R3SiOi/2 in an amount of from 10 to 30 weight % based on the total composition.
Optionally a pigment may be added. In one example, the first part and the second part are mixed together immediately prior to use in a weight ratio of about 10:1 first part to second part. A UV tracer may be added. The first part is a base part and the second part is a cure package part.
structure. a) Suitable organic solvent b) R4nSi-(OR7)4-n With n being 1 or 2
R4 is an unsaturated silicon-bonded organic group such as hydrocarbyl groups which are alkenyl groups (for example vinyl and allyl) and alkynyl groups.
R7 is an alkoxy group having from 1 to 6 carbon atoms c) R5pSi-(OR6)4.p where p may be 0, 1 or 2 preferably p is 0 or 1 R5 may be a non-hydrolysable silicon-bonded organic group such as hydrocarbyl groups which are optionally substituted by halogen such as fluorine and chlorine. Examples include alkyl groups (for example methyl, ethyl, propyl, and butyl); cycloalkyl groups (for example cyclopentyl and cyclohexyl); alkenyl groups (for example vinyl and allyl); aryl groups (for example phenyl, and tolyl); aralkyi groups (for example 2-phenylethyl) and groups obtained by replacing all or part of the hydrogen in the preceding organic groups with halogen. Preferably however, the fourth silicon- bonded organic groups is methyl. R6 is an alkoxy group having from 1 to 6 carbon atoms
(b) and (c) are different d) A Titanate of the general formula Ti[OR8]4 where each R8 may be the same or different and represents a monovalent, primary, secondary or tertiary aliphatic hydrocarbon group which may be linear or branched containing from 1 to 10 carbon atoms. Optionally the titanate may contain partially unsaturated groups. However, preferred examples of R8 include but are not restricted to methyl, ethyl, propyl, isopropyl, butyl, tertiary butyl and a branched secondary alkyl group such as 2,4- dimethyl-3-pentyl. Preferably, when each R8 is the same, R8 is an isopropyl, branched secondary alkyl group or a tertiary alkyl group, in particular, tertiary butyl.
An example composition of a second primer provided between the inner and outer layers a) A linear polydialkylsiloxane having from 3 to 15 silicon atoms, alternatively 3 to 10 silicon atoms. Each alkyl group may be the same or different and may comprise from 1 to 6 carbon atoms. b) RnSi -(OR9)4-n where n may be 0, 1 or 2 preferably n is 0 or 1.
R may be a non-hydrolysable silicon-bonded organic group such as hydrocarbyl groups. Examples include alkyl groups (for example methyl, ethyl, propyl, and butyl); cycloalkyl groups (for example cyclopentyl and cyclohexyl); alkenyl groups (for example vinyl and allyl); aryl groups (for example phenyl, and tolyl); aralkyi groups (for example 2-phenylethyl) and groups obtained by replacing all or part of the hydrogen in the preceding organic groups with halogen. Preferably however, the fourth silicon-bonded organic groups is methyl. Each R9 is the same or different and is an alkoxy group having from 1 to 6 carbon atoms c) A Titanate of the general formula Ti[OR2]4 where each R2 may be the same or different and represents a monovalent, primary, secondary or tertiary aliphatic hydrocarbon group which may be linear or branched containing from 1 to 10 carbon atoms. Optionally the titanate may contain partially unsaturated groups. However, preferred examples of R2 include but are not restricted to methyl, ethyl, propyl, isopropyl, butyl, tertiary butyl and a branched secondary alkyl group such as 2,4- dimethyl-3-pentyl. Preferably, when each R2 is the same, R2 is an isopropyl, branched secondary alkyl group or a tertiary alkyl group, in particular, tertiary butyl. d) RnSi -(OR3)4-n n may be 0, 1 or 2 preferably n is 0 or 1.
R may be a non-hydrolysable silicon-bonded organic group such as hydrocarbyl groups Examples include alkyl groups (for example methyl, ethyl, propyl, and butyl); cycloalkyi groups (for example cyclopentyl and cyclohexyl); alkenyl groups (for example vinyl and allyl); aryl groups (for example phenyl, and tolyl); aralkyl groups (for example 2-phenylethyl) and groups obtained by replacing all or part of the hydrogen in the preceding organic groups with halogen. Preferably however, the fourth silicon-bonded organic groups is methyl.
Each R3 is the same or different and is an alkoxy group having from 1 to 6 carbon atoms or an alkoxyalkylene group in which the alkoxy group has from 1 to 6 carbon atoms and the alkylene chain has from 1 to 6 carbon atoms.
(b) and (d) are different.
In the present application, viscosity was measured at 25 0 C using a Brookfield viscometer with an appropriate spindle chosen according to the viscosity required. There is thus described a thermal insulation substrate with a number of advantages as discussed above.
Although embodiments of the present invention have been described in the preceding paragraphs with reference to various examples, it should be appreciated that modifications to the examples given can be made without departing from the scope of the invention as claimed. For example, in examples in which the inner layer and/or outer layer comprise a syntactic medium, microspheres of any material and/or structure may be used.
Features described in the preceding description may be used in combinations other than the combinations explicitly described.
Although functions have been described with reference to certain features, those functions may be performable by other features whether described or not.
Although features have been described with reference to certain embodiments, those features may also be present in other embodiments whether described or not. The term "comprise" is used in this document with an inclusive not an exclusive meaning. That is any reference to X comprising Y indicates that X may comprise only one Y or may comprise more than one Y. If it is intended to use "comprise" with an exclusive meaning then it will be made clear in the context by referring to "comprising only one... " or by using "consisting".
In this brief description, reference has been made to various examples. The description of features or functions in relation to an example indicates that those features or functions are present in that example. The use of the term "example" or "for example" or "may" in the text denotes, whether explicitly stated or not, that such features or functions are present in at least the described example, whether described as an example or not, and that they can be, but are not necessarily, present in some of or all other examples. Thus "example", "for example" or "may" refers to a particular instance in a class of examples. A property of the instance can be a property of only that instance or a property of the class or a property of a sub-class of the class that includes some but not all of the instances in the class. It is therefore implicitly disclosed that a features described with reference to one example but not with reference to another example, can where possible be used in that other example but does not necessarily have to be used in that other example. Whilst endeavoring in the foregoing specification to draw attention to those features of the invention believed to be of particular importance it should be understood that the Applicant claims protection in respect of any patentable feature or combination of features hereinbefore referred to and/or shown in the drawings whether or not particular emphasis has been placed thereon.

Claims

A thermal insulation structure for a substrate for use subsea, the structure comprising:
an inner layer and an outer layer;
the inner layer being the reaction product of a first part and a second part, wherein the weight ratio of the first part to the second part is from about 15: 1 to 1 : 1 , the first part comprises any of alkenyldialkyl terminated polydialkylsiloxane, alkenyldialkyl terminated polydialkylalkenylmethylsiloxane or mixtures thereof, which will individually or collectively have a viscosity of from 250 to l OOOOmPa.s at 25°C, and a hydrosilylation catalyst, wherein the second part comprises a mixture of organohydrogensiloxane having two Si-H bonds per molecule and organohydrogensiloxane having at least three Si-H bonds per molecule;
the outer layer being the reaction product of a first part and a second part, wherein the weight ratio of the first part to the second part is from about 15: 1 to 1 : 1 , the first part comprises any of alkenyldialkyl terminated polydialkylsiloxane, alkenyldialkyl terminated polydialkylalkenylmethylsiloxane or mixtures thereof, which will individually or collectively have a viscosity of from 250 to l OOOOmPa.s at 25°C, and a hydrosilylation catalyst, wherein the second part comprises organohydrogensiloxane having at least two Si-H bonds per molecule and alkenylated MQ silicone resin, wherein said M group comprises at least two Si-alkenyl bonds per molecule.
A thermal insulation structure according to any of the preceding claims, wherein the weight ratio of the first part to the second part for the inner layer is about 1 :1.
3. A thermal insulation structure according to any of the preceding claims, wherein the weight ratio of the first part to the second part for the outer layer is about 10: 1.
4. A thermal insulation structure according to any of the preceding claims, wherein the second part of the inner layer comprises a mixture of organohydrogensiloxane having a maximum of two Si-H bonds per molecule and organohydrogensiloxane having at least three Si-H bonds per molecule.
5. A thermal insulation structure according to any of the preceding claims, wherein the second part for each of the inner and outer layers comprises any of vinyldialkyl terminated polydialkylsiloxane, vinyldialkyl terminated polydialkylalkenylmethylsiloxane or mixtures thereof.
6. A thermal insulation structure according to any of the preceding claims, wherein the alkenyl group of the alkenylated MQ silicone resin comprises 2 to 6 carbon atom.
7. A thermal insulation structure according to any of the preceding claims, wherein the alkenylated MQ silicone resin comprises vinylated MQ resin.
8. A thermal insulation structure according to any of the preceding claims, wherein a first primer is provided between the inner layer and the substrate.
9. A thermal insulation structure according to any of the preceding claims, wherein a second primer is provided between the inner and outer layers.
10. A thermal insulation structure according to any of the preceding claims, wherein the first and second primers have different compositions.
1 1. A thermal insulation structure according to any of the preceding claims, wherein the inner layer comprises a syntactic medium.
12. A thermal insulation structure according to claim 1 1 , wherein the syntactic medium comprises microspheres.
13. A thermal insulation structure according to claims 11 or 12, wherein the microspheres comprise ceramic microspheres.
14. A thermal insulation structure according to any of the preceding claims, wherein the inner layer comprises about 2 to 6 % by weight microspheres.
15. A thermal insulation structure according to any of the preceding claims, wherein the inner layer comprises about 4 % by weight microspheres.
16. A thermal insulation structure according to any of the preceding claims, wherein the outer layer comprises a syntactic medium.
17. A thermal insulation structure according to claim 16, wherein the syntactic medium comprises microspheres.
18. A thermal insulation structure according to claim 17, wherein the microspheres comprise glass microspheres.
19. A thermal insulation structure according to claims 16 or 17, wherein the microspheres comprise borosilicate glass microspheres.
20. A thermal insulation structure according to any of the preceding claims, wherein the outer layer comprises about 2 to 6 % by weight microspheres.
21. A thermal insulation structure according to any of the preceding claims, wherein the outer layer comprises about 4 % by weight microspheres.
22. A thermal insulation structure according to any of the preceding claims, wherein the inner layer comprises filler.
23. A thermal insulation structure according to any of the preceding claims, wherein the outer layer comprises filler.
24. A thermal insulation structure according to claims 22 or 23, wherein the filler is reinforcing filler, non-reinforcing filler or a mixture thereof.
25. A thermal insulation structure according to any of the preceding claims, wherein the inner layer has a thickness of about 5 to 50 mm.
26. A thermal insulation structure according to any of the preceding claims, wherein the inner layer has a thickness of about 20 mm.
27. A thermal insulation structure according to any of the preceding claims, wherein the outer layer has a thickness of about 10 to 250 mm.
28. A substrate for use subsea comprising a thermal insulation structure according to any of the preceding claims.
29. A substrate according to claim 28, wherein the substrate is metal.
30. A substrate according to claims 28 or 29, wherein an anticorrosion coating is provided on the substrate.
31. A substrate according to claim 30, wherein the anticorrosion coating is an epoxy phenolic coating.
32. A method of providing a thermal insulation structure for a substrate for use subsea, the method comprising: providing a structure comprising:
an inner layer and an outer layer;
the inner layer being the reaction product of first and second parts, wherein the weight ratio of the first part to the second part is from about 15: 1 to 1 :1 , the first part comprises any of alkenyldialkyl terminated polydialkylsiloxane, alkenyldialkyl terminated polydialkylalkenylmethylsiloxane or mixtures thereof, which will individually or collectively have a viscosity of from 250 to l OOOOmPa.s at 25°C, and a hydrosilylation catalyst, wherein the second part comprises a mixture of organohydrogensiloxane having two Si-H bonds per molecule and organohydrogensiloxane having at least three Si-H bonds per molecule;
the outer layer being the reaction product of first and second parts, wherein the weight ratio of the first part to the second part is from about 15: 1 to 1 :1 , the first part comprises any of alkenyldialkyl terminated polydialkylsiloxane, alkenyldialkyl terminated polydialkylalkenylmethylsiloxane or mixtures thereof, which will individually or collectively have a viscosity of from 250 to l OOOOmPa.s at 25°C, and a hydrosilylation catalyst, wherein the second part comprises organohydrogensiloxane having at least two Si-H bonds per molecule and alkenylated MQ silicone resin, wherein said M group comprises at least two Si-alkenyl bonds per molecule.
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